High-temperature crystal chemistry of Na6(UO2)2O(MoO4)4
- Authors: Nazarchuk E.V.1, Siidra O.I.1, Krivovichev S.V.1
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Affiliations:
- St. Petersburg State University
- Issue: Vol 58, No 1 (2016)
- Pages: 6-9
- Section: Article
- URL: https://journals.rcsi.science/1066-3622/article/view/223326
- DOI: https://doi.org/10.1134/S1066362216010021
- ID: 223326
Cite item
Abstract
Thermal deformations of Na6(UO2)2O(MoO4)4 were studied by high-temperature powder X-ray diffraction. The compound crystallizes in the triclinic system, space group Р\(\bar 1\), a = 7.636(7), b = 8.163(6), c = 8.746(4) Å, α = 72.32(9)°, β = 79.36(4)°, γ = 65.79(5)°, V = 472.74(4) Å3. It is stable in the temperature interval 20–700°С. The thermal expansion coefficients (TECs) are α11 = 25.5 × 10–6, α22 = 7.8 × 10–6, and α33 = 1.1 × 10–6 (°C)–1. The orientation of the TEC pattern relative to the crystallographic axes is a33^Z = 45°, a33^X = 122°, a22^Z = 59°, and a22^X = 66°. The anisotropy of the thermal expansion is due to specific features of the crystal structure of the compound.
About the authors
E. V. Nazarchuk
St. Petersburg State University
Author for correspondence.
Email: e_nazarchuk@mail.ru
Russian Federation, Universitetskaya nab. 7/9, St. Petersburg, 199034
O. I. Siidra
St. Petersburg State University
Email: e_nazarchuk@mail.ru
Russian Federation, Universitetskaya nab. 7/9, St. Petersburg, 199034
S. V. Krivovichev
St. Petersburg State University
Email: e_nazarchuk@mail.ru
Russian Federation, Universitetskaya nab. 7/9, St. Petersburg, 199034